[GRASS-dev] r.resample.rst behavior does not match manual

[Michael Barton]

Thanks for all the responses and fixes. I should have some time in the next week to look at these.

Michael
____________________
C. Michael Barton
Director, Center for Social Dynamics & Complexity 
Professor of Anthropology, School of Human Evolution & Social Change
Head, Graduate Faculty in Complex Adaptive Systems Science
Arizona State University

voice:  480-965-6262 (SHESC), 480-965-8130/727-9746 (CSDC)
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www: http://www.public.asu.edu/~cmbarton, http://csdc.asu.edu















> On Sep 6, 2015, at 6:26 AM, Markus Neteler <neteler at osgeo.org> wrote:
> 
> On Mon, Aug 31, 2015 at 1:55 AM, Michael Barton <Michael.Barton at asu.edu> wrote:
>> Thanks for the clarification Stefan.
>> 
>> It sounds like, unlike other resampling commands (unless they, too, are in
>> error), r.resample.rst needs to be run at the resolution of the original
>> map, not the output map.
> 
> Yes. It has been implemented like that (not sure if there is any
> technical reason), yet going a bit against the "normal" workflow.
> 
>> The output resolution will be determined by the
>> command, not by the region settings. This should go into the manual too,
>> along with the revised text you suggested.
> 
> Stefan, Michael, please send a text snipped to me for the manual.
> 
>> In a somewhat related question, do you have any idea how r.resample.filter
>> works? The manual is not very informative
> 
> True - thanks to my long term inbox I found material here
> https://trac.osgeo.org/grass/ticket/1401#comment:8
> 
> and merged it into the manual page:
> https://grass.osgeo.org/grass70/manuals/r.resamp.filter.html
> https://grass.osgeo.org/grass71/manuals/r.resamp.filter.html
> 
> (please revise as needed).
> 
>> and I couldn’t get any useful
>> downscaling results (lower to higher resolution) with my spot tests.
> 
> Adding some examples there would be important.
> 
>> r.resample.interp doesn’t seem to give expected results either. I’ll do a
>> test with demo data when I have a few minutes this week. I did get very good
>> downscaling results with r.resample.bspline, but it took a very long time.
> 
> Perhaps time to expand
> https://grasswiki.osgeo.org/wiki/Interpolation#Resampling_of_raster_maps_to_finer_resolution
> ?
> 
> Markus